Safety device for elevators.



W. H. GULDER.

SAFETY DEVICE FOR ELEVATORS.

APPLICATION 111110 MAY 27. 1915.

,QQOUML Patented Mar. 27, 1917.

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W. H. (SOLDER.

SAFETY DEVICE F-OR ELEVATORS.

APPLICATION FILED MAY 27. 1915.

l ,2%@341 n Patented Mar. 27, 1917.

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WILLIAM'E. GOLDER, OFNEWARK, NEW JERSEY.

SAFETY DEVICE FOR ELEVATORS.

Application filed May 27, 1915.

To all whom t may concern."

lle it known that l, WILLIAM H. GOLDER, a citizen of the United States,residing at ewark, in the county of Essex and State cf New Jersey, haveinvented certain new and useful improvements in Safety Devices forElevators; and l do hereby declare the :following to be a full, clear,and exact description of the same, reference being had to theaccompanying Y. drawings, forming part of this specification, and to thefigures and letters of reference marked thereon.

rlhis invention relates to improvements in elevator safety devices, andmore particularly to a novel arrangement for preventing access to theelevator shaft except at a landing at which the car is in full stopposition.

'lhe novel features of the present invention are advantageously embodiedin a system in which locking mechanism is provided for preventingopening of the landing door except when a car has arrived at full stopposition at the landing, the locking mechanism being engageable byconnections carried by the car, which connections, upon manipulation ofthe controller to full stop position, are effective to release thelocking mechanism and thereby permit opening of the door. Opening of thedoor in turn actuates suitable mechanismvwhich locks the controller infull stop position, and consequently, movement 'of the car, while thelanding door is open, is prevented. 'llhc primary object of the presentinvention is to generally improve and simplify the construction ofelevator safety device operating in accordance with the aforesaid systemand to so reduce the number of parts that the device may beinstalledwithin reasonable limits of cost.

A full understanding of the invention will be attained from thefollowing detailed description taken in connection with the accompanyingdra-wings which illustrate a structural embodiment of the invention in apreferred form, and the novel features of the invention will beparticularly pointed out and specified in the appended claims.

ln the drawings,-

Figure 1 is a fragmentary transverse section of an elevato-r shaft at alanding point and also of an elevator car shown just before the car hasarrived at or just after leaving the landing, .the car and landingSpecification of Letters Patent.

Patented Mar. 27, 191% Serial No. 30,793.

door being equipped with a safety device constructed in accordance withthe present invention.

Fig. 2 is a fragmentary plan view show ing the parts in the samepositions illustrated in Fig. 1.

Fig. 3 is a view similar to Fig. 1 but showing the car in full stoppositicnrat the landing, and the positions which the parts assume whenthe controller is thrown to full stop position.

Fig. 4 is-a view similar to Fig. 3 but showing the position of the partsafter the door has been opened and the controller locked in full stopposition.

Like letters of reference in the several figures indicate similar parts.

The elevator shaft 1 is provided with a suitable landing, this beingindicated diagrammatically by the transverse sill 2, and t the landingcage 3 having a landing door 4:. As is customary the landing door ispreferably mounted for sliding movement within the cage to permit accessto the shaft 1, when the car is in passenger receiving or dischargingposition, in front of the landing cage 3, and the door will also beprovided with a manually operable latch or other device 5 by which itcan be opened or closed from the interior of the car.

Mounted on the landing door t, for in* stance, by means'of a dependingU-bracket 6 is a wheel or 'roller 7. When the parts are in such relationthat the door can be opened, said wheel 7 travels upon amovable track 8which consists, inthe form illustrated in the drawings, of a rod havinga bent extension 9, and the free end of said extension is pivotallymounted on a supporting bracket 10 resting on the transverse sill 9,.Extending from the pivotal point of the movable track 8 is a bell cranklever 11 having at the free end of its horizontal arm 12 a roller orother suitable contact device 13. A spring 14, secured at one end to thebell crank lever 11 and at the other end to sill 2, normally urges thebell crank lever into such position that movable track 8 is thrustupwardly into the path of wheel 7.

Pivotally mounted in a supporting bracket 1'5 resting upon the sill 2,is a locking member or plate 16. Said locking member 16 is provided withan upper locking pin 17 and a lower locking pin 18, the pins being sopositioned that the line connecting their centersis oblique with respectto the vertical dimension'V of the locking member 16. A spring 19 havingone'end secured to the locking member andthe other secured to the sill 2maintains the locking member normally in substantially verticalposition. rlhe locking member is located approximate to that end of themovable track 8 opposite from the pivotal point of said track and whenthe parts are in their normal relation, as shown in Figs. v1 and 2, theend of the movable track is projected between the locking pins 17 and18. Locking pin 17 forms a stop against farther upward movement of thetrack 8 about its pivot and lowerlocking pin 18 prevents downwardpivotal movement of said track. It will be noted that when the movabletrack'is thus retained or locked by the pins it lies in a plane obliquewith respect to the Vplane of travel of roller 7 and thereby forms anabsolute stop against movement of roller 7 along the track consequentlypreventing opening ot' the landing door.

Extending downwardly from the pivotal point of the locking member 16 isa bell crank lever 20, the horizontal arm 21 of which is'V provided atits free end with a roller or suitable contact member 22. Pivotalmovement of the bell crank lever 20 will be transmitted to the. lockingmember 16 and such pivotalmovement of the bell crank lever isaccomplished by controller operated vconnections carried by the elevatorcar, as

will presently appear. -Mounted on the controller box23 within the car24 is a kconventional type of controller lever 25 having a depending arm26 responsiveto movement of said lever. At the lower end of said arm -26is a roller or suitable contact piece 27 engageable with a lug 28, whenthe controller lever 25 is shifted by the operator to vertical position,or to position to shut'o power from the car and thereby cause the caa`to make a full stop. A lug 28 is mounted on the upper end of a rod 29slidable within a bearing bracket 30 secured to a wall of the car 24. Atits lower end rod 29 is pivotally connected to a link 31, which linkprojects through an opening in the car tloo-r and is pivoted at itslower end to the horizontal arm of a bell lcrank lever 32. The bellcrank ever is rockably mounted at 33 in a supporting bracket 34 securedto the under side oi the car floor. The vertical arm 35 or the bellcrank lever 32 is pivoted at its free end to an operating rod 36. Saidoperating rod 36 is in turn pivotally connected at 37 to a swinging arm38 mounted at its inner end in a bracket plate 39 (see Fig. 2). Swingingmovement of the arm 38 is limited by means ot a'bracket 40 having spacedstops 41, 42, between which said arm 38 projects, and a spring 43normally urges arm 38 into en gagement with stop 42. The outer end ofarm 38 projects beyond the side of the car facing the landing sill 2 andsaid outer end is provided with a member 44 adapted to make contact withroller 22 carried by bell crank lever 20 when arm 38 is drawn by rod 36toward stop 41. As shown, said member 44 is provided with a dishedsurface 45 so as to afford a proper engagement with roller 22 when saidarm 38 is thrown in the direction described. It will be noted thatswinging arm 38 and its connections are structurally independent of thecontroller lever and hence are unaffected by movements et the controllerlever, except when the controller lever is shifted to full stopposition, when contact piece 27 engages lug 28 and moves rod 29downwardly. This arrangement leaves the controller free to operate`unhampered by a long connected chain of parts, except when the car isbrought to a dead stop. The life of the connections to rod 29 isconsiderably greater than would be the case, it every slight movement ofthe controller were transmitted to them.

Fixed to the controller arm 25 is a notched lug 46 and pivotally mountedin a support 47 carried by the side of the car 24 is a locking lever 48having a locking hook 49 adapted to enter the notch in lug 46. Movementof the locking lever 48 is effected by the rod 50 connected at its upperend to said locking lever and at its lower end with the horizontal arm51 of a bell crank lever 52 in a supporting bracket 52n projecting 'fromthe under side of the car floor. The vertical arm 53 of said bell cranklever is connected to a rod 54, which rod 54 is pivoted at 55 to aswinging arm 56. Said arm 56 is mounted similarly to arm 38 and as shownin the drawings, is adapted t0 swing between stops 57, 58, provided by abracket 59 through which said arm 56 is projected. A. spring 60 urgesthe operating arm into contact with stop 58. The free end 0l theoperating arm projects in like manner beyond the side of the car facingthe sill 2 and is similarly provided with a member 61 for cooperationwith roller 13 carried by the horizontal. arm 12 of bell crank lever 11.

The operation of the above described mechanism is as follows:

`When the elevator car has arrived at a position approximate to thelanding door 4, movement oit the controller lever 25 to vertical or fullstop position, as shown in Fig. 3, causes contact piece 27, carried atthe end of arm 26, to engage lug 28, thereby forcing rod 29 downwardlyand through link 31 throwing bell crank lever 32 in a direction to drawrod 36 to the left, as shown in Fig. 3. This movement of rod 36 swingsarm 38 until said arm contacts with stop 41, thereby causing member 4lto engage roller 22 and shift bell crank lever 2O to the positionindicated by dotted 'lines `in Fig. 3. Swinging of bell crank lever 20also swings lockingmem'ber 16 outwardly away from track 8 so thatlocking pin 18 is i'emoved `frombeneath the end of `the track as shownin IFig. A3. lNhen the parts are thusdispesedmovable track 8 is free to`move downwardly about its pivot and at the same time'is retained fromspringing upwardlyiby upper locking pin 117 which `is still inengagement with the end of track 8. Track 3 being free to'movedownwardly,

`the landing door 4 may be opened, roller 7 swinging arm 5G in a`manner-to throw said arm against stop 57 and through connecting rod v54operate bell-crank lever 52. @peration of bell crank lever 52 throws rod50 upwardly and such movement of rod 50 causes locking'hook 49 to engagethe notched lug 46 in the manner shown in Fig. 4, and, consequently,lock the controller lever in full stop position. Movement of thecontroller lever to apply power to the car is thus prevented so long yasthe landing door is open.

W'hen the landing door is closed spring 14 withdraws roller 13 fromengagement "with member Gland consequently spring 60 is releasedthrowing operating arm 58 back to the position shown in Fig. 2 andthrough the intermediate connections lifting locking lever 48 therebypermitting free movement or manipulation of the controller 25. When thecontroller 25 is thrown to position to start the car, roller 27 isdisengaged from lug Q8 thereby permitting spring 43 attached to arm 3Sto lift rod 29 and swing arm 38 to release member 44 from contact withroller 22. This permits spring 19 to restore locking member 1G to theposition shown in F ig. 1 with lower locking pin 18 beneath'the end ofmovable track 8 holding said track in elevated position so as to form apositive stop against opening of the door.

1. In an elevator safety device, the combination with an elevator shaft,landing door and elevator car having a controller, of a movable trackmounted on the landing, a wheel carried by` the landing door and adaptedto travel on said track, mechanism for locking said track in suchposition that the track forms an obstruction vto the travel of the wheeland thereby prevents opening of the landing door, connections carried bythe car and engageable with said locking mechanism to release thelocking mechanism from locking relation with respect to the track uponarrival of the car at a landing,

and means for operating said connections by throwing the controller tofull stop position.

2. In an elevator safety device, the combination with an elevator shaft,landing door track upon arrival ofthe car at a landing, means foroperating said connections by throwing the controller to full stopposition, and ymeans operated by opening ofthe landing door for lockingthe controller in full stop position.

3. In an elevator safety device, the'combination with an elevator shaft,landing door and elevator car having a controller,

`of a movable track mounted on the landing,

a wheel carried by the landing door and adapted to travel on said track,mechanism for locking said track in such position that the track formsan obstruction to the travel of the wheel and thereby prevents openingof the landing door, and connections carried by the car and structurallyindependent of the controller but arranged to be positively operated bythe controller when the controller is shifted to full stop position,said connections being engageable with said locking mechanism to releasethe locking mechanism from locking relation with respect to the trackupon arrival of the car at a landing and shifting of the controller tofull stop position.

4. In an elevator safety device, the combination with an elevator shaft,landing door and elevator car having a controller, of a movable trackmounted on the landing, a wheel carried by the landing door and adaptedto travel on said track, mechanism for locking said track in suchposition that the track forms an vobstruction to the travel of the wheeland thereby prevents opening of the landing door, connections carried bythe car and structurally independent ofthe controller but arranged to bepositively operated by the controller when the controller is shifted tofull stop position, said connections being engageable with said lockingmechanism to release the locking mechanism from locking relation withrespect tov the track upon arrival of the car at a landing and shiftingof the controller to full stop position, and means operated by openingof the landing door for locking the controller in full stop position.

5. In an elevator safety device, the comvfrom locking relation withrespect tothe bination With an elevator shaft, landing door and elevatorcar having a controller, of a movable track mounted on the landing, aWheel carried by the landing door and adapted to travel on said track,mechanism for locking said track in such position that the track formsan obstruction to the travel of the wheel and thereby prevents opening`of the landing door, connections carried by the car and engageable Withsaid locking mechanism to release the locking mechanism from lockingrelation with respect to the track upon arrival of the car at a landing,means for operating said connections by throwing the controller to fullstop position, said track after release being moved by travel of theWheel thereupon during opening of the landing door, and means responsiveto said movement of the track for locking the controller in full stopposition.

6. In an elevator safety device, the com` bi-nation With an elevatorshaft, landing door and elevator car having a controller,

of a movable track mounted on the landing,

a Wheel carried by the landing door and adapted to travel on said track,mechanism for locking said track in such position that the track formsan obstruction to the travel of the Wheel and thereby prevents openingof the landing door, connections carried by the car and engageable withsaid locking mechanism to release the locking mechanism from lockingrelation with respect to the track upon arrival of the car at a landing,means for operating said connections by throwing the controller to fullstop position, said track after release being moved by travel of theWheel thereupon during opening of the landing door, means responsive tosaid movement of the track for locking the controller in `full stopposition, and a spring for restoring the track to Wheel travelobstructing position and for simultaneously releasing said controllerlocking means upon closing of the landing door.

WILLIAM H. GOLDER.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents. Washington, D. C.

